Britain is an island, surrounded by seas that go up and down all day long, quite literally as regular as clockwork. Generators just need something to turn them, the rising and falling seas can do that. So why are we not doing it? There was a fairly large scheme mooted for the Severn, was scrapped cos birds, apparently. The scheme would have taken an acre or two of the Severn shore, birds would cope. So what was really behind that? Why do we not have small tidal power stations every mile or so dotted around the coast? The sea moving millions of gallons of water twice a day (4 times in the Solent, still don’t know why), is a shit-load of energy that can be converted for our use, so why isn’t it happening?